<template>
  <!-- 面包屑导航栏 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>角色列表</el-breadcrumb-item>
  </el-breadcrumb>

  <!-- 卡片视图 -->
  <el-card>
    <!-- 添加角色按钮区域 -->
    <el-row>
      <el-col>
        <el-button type="primary">添加角色</el-button>
      </el-col>
    </el-row>
    <!-- 角色列表区域 -->
    <el-table :data="rolesList" border stripe>
      <!-- 展开列 -->
      <el-table-column type="expand">
        <template v-slot="scope">
          <el-row
            :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
            v-for="(item1, i1) in scope.row.children"
            :key="item1.id"
          >
            <!-- 渲染一级权限 -->
            <el-col :span="5">
              <el-tag closable @close="removeRightById(scope.row, item1.id)">{{
                item1.authName
              }}</el-tag>
              <i class="el-icon-caret-right"></i>
            </el-col>
            <!-- 渲染二级和三级权限 -->
            <el-col :span="19">
              <!-- 通过 for 循环 嵌套渲染二级权限 -->
              <el-row
                :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                v-for="(item2, i2) in item1.children"
                :key="item2.id"
              >
                <el-col :span="6">
                  <el-tag
                    type="success"
                    closable
                    @close="removeRightById(scope.row, item2.id)"
                    >{{ item2.authName }}</el-tag
                  >
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <el-col :span="18">
                  <el-tag
                    type="warning"
                    v-for="item3 in item2.children"
                    :key="item3.id"
                    closable
                    @close="removeRightById(scope.row, item3.id)"
                    >{{ item3.authName }}</el-tag
                  >
                </el-col>
              </el-row>
            </el-col>
          </el-row>
        </template>
      </el-table-column>
      <!-- 索引列 -->
      <el-table-column type="index"></el-table-column>
      <el-table-column label="角色名称" prop="roleName" />
      <el-table-column label="角色描述" prop="roleDesc" />
      <el-table-column label="操作" width="300px">
        <template v-slot="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit"
            >编辑</el-button
          >
          <el-button size="mini" type="danger" icon="el-icon-delete"
            >删除</el-button
          >
          <el-button
            size="mini"
            type="warning"
            icon="el-icon-setting"
            @click="showSetRightDialog(scope.row)"
            >分配权限</el-button
          >
        </template>
      </el-table-column>
    </el-table>
  </el-card>

  <!-- 分配权限的对话框 -->
  <el-dialog
    title="分配权限"
    v-model="setRightDialogVisible"
    width="50%"
    @close="setRightDialogClosed"
  >
    <!-- 树形控件 -->
    <el-tree
      :data="rightslist"
      :props="treeProps"
      show-checkbox
      node-key="id"
      accordion
      default-expand-all
      :default-checked-keys="defKeys"
      ref="treeRef"
    >
    </el-tree>
    <!-- 底部区域 -->
    <template #footer>
      <span class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </template>
  </el-dialog>
</template>

<script>
import { getCurrentInstance, onMounted, reactive, ref, inject } from "vue";
export default {
  setup() {
    // 获取vue实例
    const { proxy } = getCurrentInstance();
    // 注入一个axios
    const axios = inject("axios");

    // 存放渲染数据
    let rolesList = reactive([]);
    // 控制分配权限对话框的显示与隐藏
    let setRightDialogVisible = ref(false);
    // 修改用户的对话框的ref
    let treeRef = ref(null);
    // 所有权限的数据
    let rightslist = reactive([]);
    // 树形控件的属性绑定对象
    const treeProps = reactive({
      label: "authName",
      children: "children",
    });
    // 默认选中的节点Id值数组
    let defKeys = reactive([]);
    // 当前即将分配权限的角色id
    let roleId = ref("");

    // 页面初始化请求数据
    const getRolesList = async () => {
      rolesList.length = 0;
      const { data: res } = await axios.get("roles");
      if (res.meta.status !== 200)
        return proxy.$message.error("获取角色列表失败！");
      rolesList.push(...res.data);
    };
    onMounted(() => {
      getRolesList();
    });

    // 根据Id删除对应的权限
    const removeRightById = async (role, rightId) => {
      // 弹框提示用户是否要删除
      const confirmResult = await proxy
        .$confirm("此操作将永久删除该文件, 是否继续?", "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        })
        .catch((err) => err);
      if (confirmResult !== "confirm")
        return proxy.$message.info("取消了删除！");
      const { data: res } = await axios.delete(
        `roles/${role.id}/rights/${rightId}`
      );
      if (res.meta.status !== 200)
        return proxy.$message.error("删除权限失败！");
      role.children = res.data;
    };

    // 展示分配权限的对话框
    const showSetRightDialog = async (role) => {
      rightslist.length = 0;
      roleId.value = role.id;
      // 获取所有权限的数据
      const { data: res } = await axios.get("rights/tree");
      if (res.meta.status !== 200)
        return proxy.$message.error("获取权限数据失败！");

      // 把获取到的权限数据保存到 data 中
      rightslist.push(...res.data);

      getLeafKeys(role, defKeys);

      proxy.$nextTick(function () {
        //Dom更新完毕
        treeRef.value.setCheckedKeys(defKeys);
      });

      setRightDialogVisible.value = true;
    };

    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    const getLeafKeys = (node, arr) => {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) return arr.push(node.id);

      // 如果包含则接着往下找
      node.children.forEach((item) => getLeafKeys(item, arr));
    };

    // 监听分配权限对话框关闭事件
    const setRightDialogClosed = () => {
      defKeys.length = 0;
    };

    // 点击为角色分配权限
    const allotRights = async () => {
      const keys = [
        ...treeRef.value.getCheckedKeys(),
        ...treeRef.value.getHalfCheckedKeys(),
      ];

      const idStr = keys.join(",");

      const { data: res } = await axios.post(`roles/${roleId.value}/rights`, {
        rids: idStr,
      });

      if (res.meta.status !== 200) return this.$message.error("分配权限失败！");

      proxy.$message.success("分配权限成功！");
      getRolesList();
      setRightDialogVisible.value = false;
    };

    return {
      rolesList,
      setRightDialogVisible,
      rightslist,
      treeProps,
      defKeys,
      treeRef,
      roleId,
      removeRightById,
      showSetRightDialog,
      setRightDialogClosed,
      allotRights,
    };
  },
};
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>